又一很有可能的罪魁祸首，是发生6300万前至67万年前之间一系列的巨大火山爆发。
Another leading culprit is a series of colossal volcanic eruptions that occurred between 63 million to 67 million years ago.
墨西哥的尤卡坦半岛的一个巨大火山口的产生日期可以追溯到约65万年前，这个时期正好与大规模的物种灭绝相一致。
A huge crater off Mexico's Yucatan Peninsula is dated to about 65 million years ago, coinciding with the extinction.
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